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14 White-lined chipboard (WLC) WLC (Fig. 17) comprises middle plies of recycled pulp recovered from mixed papers or carton waste. The middle layers are grey in colour. The top layer, or liner, of bleached Paper and paperboard – raw materials, processing and properties 25 chemical pulp is usually white mineral pigment coated. The second layer, or under liner, may also comprise bleached chemical pulp or mechanical pulp. e. no white, or other colour, liner. The reverse side outer layer usually comprises specially selected recycled pulp and is grey in colour.

They are discussed in the package-specific chapters which follow. These processes include offset lithography, Paper and paperboard – raw materials, processing and properties 31 flexography, letterpress, gravure, silkscreen and digital printing. They vary in several important characteristics, chiefly in relation to the ink and varnish formulations, the techniques by which they are applied to the paper or paperboard substrate and the processes by which they dry and become permanent and durable. Despite the variability, there are common features relating to printability which apply to all papers and paperboards.

For specific papers and paperboards, thickness increases with basis weight, and hence for a given grade, several strength properties increase with increasing thickness. However, as will be seen when stiffness is discussed, thickness can be more relevant than basis weight. 4 Moisture content Moisture content is measured as a percentage of the dry weight. Many strength properties alter with changes in moisture content. The cellulose fibres in paper and paperboard will expand by absorbing moisture in high RH and shrink by losing moisture in low RH conditions.

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Air Force Stealth Technology Review [PowerPoint Presentation]


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